Furnace



Patented Nov. 6, 1928.

UNITED STATES PATENTJOFFICE.

MACHINERY COMPANY, A CORPORATION or MASSACHUSETTS.

V FURNACE.

Application fi led March 11, 1925. Serial No. 14,770.

My invention relates to furnaces.

.An object of my invention is to provide an improved furnace. Another object of my 1nvent-ion is to provide an improved blank heating: furnace for heating blanks preliminary to forging operations. A further obj ect ofmyinvcntion to provide an improved heating furnace having means whereby blanks may be antomatically fed through the furnace and auto- I matically discharged when heated to the desired temperature. Still another object of my invention is to provide animproved blank heating furnace having improved means whereby the discharge of the blanks from the furnace 1 may be controlled automaticallyinaccordance with the temperaturetherein. Another-object of my inventionpis to provide a blank heating furnace having automatically driven reciprocable blank discharge mechanism yo wherein said discharge mechanism may be controlled automaticallyin accordance with the variation of the temperature in the turnace; A still further object of my invention is toprovide an improved automatic blank a heating furnace. whereinthe maximum heat-j ing efficiency and a uniform temperature of the blanksma be obtained. These and other objects and a vantages ofmy inventionwill, however, hereinafter more fully appear.

In the accompanying drawings I have shown for purposes of illustration one form which my inventionmay assume inpractice. In these drawings-Q pp v Fig. 1 isavertical sectional view through improved blank heating furnace, certain parts thereof being shown in elevation. Fig. 2 is a vertical transverse sectional view taken substantially on line 2.2 of Fig. 1.

Fig. 3 is a diagrammatic View of my improved controlling mechanism.

In this illustrative construction have shown .a blank heating furnacefgenerally designated 1,..of the same general type as that described in a pendingapplication toone Sven I T. Nelson, [Serial No. 511,900, filed October. 31, 1921 with the exceptionfofj difterences and improvements pointed out below, and including automatic blank dischargi ng means, generally designated 2. The turnace 1 together with the blank discharging means 2 is mounted upon a suitable frame or casing 3 of generally rectangular cross section having the usual supportinglegs 4: and a substantially"horizontal metal cover. or housing 5 at thetop thereof. The frame 3 and the cover 5 are lined on the top, bottom, sides, and back with. fire brick 6, all joints being luted with fire clay; Carried by the cover member?) there is an oil burner? of usual form having an atomizing nozzle 8 projecting downwardly through a suitable opening 9 ti'orn'ied in the fire brick. This burner 7 is disposed in a substantially vertical plane and is adapted to discharge a gaseous mixture directly toward the inclined bottom of a combustion chamber 10. The combustion chamber 10 isprovidedwith inclined sides and front walls 11 and a vertical'rear wall'lQ which converge toward the bottom of the fur: nace, restricting "the same and thereby intensifying the heat at that point. Suitable laterally disposed vents or fines 13 are pro vided con't-igiuous tothe bottom of the chamher for discharging the burnedgaseous mixture from the combustion chamber. Disposed centrally of the inclined front wall of the furnace and projecting within the combustionchamber 10 are guide ribs leproviding an inclined guideway for a series of blanks 15. Arranged in the cover member. 5 at the top of the furnaoe is arfeed'slot .16 provided with a pivoted closure memberl'f and this slot is disposed in alineme'nt with the channel formed by the guide ribs 14in whiclrthe blanks are to be guided durin heating thereof. It will herein be observe that the blanks inserted through the slot 16 remain superimposed, one upon another, between the guides, 14 and are gradually vfed down on operation of improved discharging means to be hereinafter described by gravity. It will be evident that the blanks may be fed into the furnace in any other sui-tableinam ner. It will also be evident that one or more stacks of bits may be provided in the furnace and that the furnace may be designed to accommodate as many stacks as desired. Herein it willbe noted from Fig-3.1 and2 that theblanks are partially protected by the guides .l liirom the direct heat of thecoinbustion chamber and as a result, only the pro jecting portion, whiclrwill be the portion to beworked. will be heated up to thefhighest teu'lperature. y I

a suitable water jacket 18 or usual. form and at the upper surface .o'flth e water jacket in ejector 20 is reciprocable adapted to engage The bottom'of the furnaceisprovided with ing rod or pitrnan 28. The crank disk 27 is,

su tziblir swa ed to; e horizoritiil sheftIZQ hwi s te l e d 21is t i; 39 ind .1. fiiiilielectric r ri otor 32 which is herein oi h 'ebl S1 E ime? I is bv ou th t 3 M5 6 t mgtet gi b i cl d pwtgemw s edl eti nsw ns' oft-n? o h r imble type 'v u ti t d o t ed wt n fli ll'i lig $l 1 9\\ ]1. will herein be noted that the wtiterjzickfet l8 prevents excessii e heiiting Oftheejectoir ZO, It will :ilso be evident tilt Ll} t e guide may; e wate o e t e -9a- Pt r -d." diit iolling ea s re pn r efl 'Q Y h meter h reby. he speed, of th et er" '1 213' e ce t ii hd e i emet te lr n e et en it v l tem retur it tli-u c u nece. Such" ineans comprises a: thermocouple 33 I w ich. p eie s ats e bi: n by h f rna e a a.

Pbi in free 5f the s im f leeks and r frblii ire tfittw t eb i ner is c ea y. lustre edl-i i fi si eir t n e sire the tI Br h R QL P may e qsef d eto her-poihts ni lie urnace is t itme eup ei s of e l known cornlilerciirl f orrn audincludes nieztns forg'enerat ng hyrnieansof the heat of, the

turn fi c T low "voltage electricity; shown, e -l tmb -eeup e 3 s; onns c ed. y means Qt 9 .u tl ns' t 'res 34. i a c ntro Py dm-f e ensn. 1 fle isnets fiwrh ll there n of .w -l iern"c ne i r yre. n ieci telly ee i t-feetsrinte m i 're t s j T e py ems er e ens hrws o d c o s 36 with the main su ful y lines this pi ljo neter 1s ra dgiptecl 0 control the flow, 0t cur- 13 i m h imellilille i fifi i re sl 9 ductor wires 38 leading to a controlling mechanism, generally desigiiz'rted 3Q,'w liich, is of well known coi'nlnercizil; type and further deh int fin if t il sl i d,unhec ery i is on t mere y ine i de en e e t ce y.

hi es er oete (net 'sho.w )v wh s tieptdl q mise; ha'l i s u t-able 0. 1 1 91 -v tionsjncludin a link 40, t levei; 41 or arheostat ,or other si iit zible controlling device, the

ltittler (ammo; is adeiitedtocontrolthe n t of c urnent frof nthe lnein supply lines 37' through conductorgwiresl'fi leading to "the, n otof f L 32 a; well; known rnnnner, It will herein be noted that in place of a servo-motor any ui ble e o c ntral relay sw tc mechan sm, soleno d derlic e. for the hkeinay beusc'd to out 1n or, 'cut out the motor circuit after the stacker blanks have been inserted H I "improvedfhi'nace; above described;it'willherein be noted that into the furna ze tln'oughtheislgt l fi and the burner 7 has been regulated, bringing the temperature within the combustion chamber to approximately th desired: l t imlimshfifl is absorbed; by, the blanks. and transmitted to the thermo-couple 33. Electricity is generated within the thermocouple and is transmitted through the conductor 34 to the control pyi'ometcr 35 which controls the flow of current iroin the conductor 36 through the conductor 38 to the controliing nieclianismfii), octu 't ing theletter and consequent]ythrough the connections 40 the rheostat lever is swung about its pivot, thus connectin the conductor ,3 w th the ine 1? actuating e discharge inotor 32. The iiiotor 32 tlieri; iletu es, through the connections heretofore de- SQ'jlfllitd the plunger; 20 and the blanksbeing intermittently disclmrged froin the furniice at the requisitds peed. As the heat vzrries wizithin theffurnnce the flow of current to the mQter' zZ s b i f quentlr V d y eans f the controlling" devicesf35 and 39. Itwill: be evident that when the te uperz ture within the co nhustion f chamber is too low the motor 32; is stopped, consequently stopping the, bh nl; discharge mechzrnlsn'i and when the tQlTlPQl'ii-a ture within thecombustion chainber increuses the speed of the motor 32 is proportionally increased.

As a, result of my invention itwill hereinj he nQtQd th at unimproved blenk heating furnace is provided wherein n axiinuin eflficicncy and a uniform temperatuige of the dischirrge blanks isjobtained. will further beinotedl that. an improved furnace is provided whereinj as the ten iperziture within the combustion chamber vgiries, the speed ofthe bh nl; dis: ch21 ge or is also ueried; thus elin iinnting a" too h t o a. e dhlenk,

' While I have inthis :rpplicntion speci fir-id ly described one form which my invention may assume in practice, it willbe understood that this form of the seine is shown for purposes of illustration and that the invention nifty be modified andkinbodied infturrious other forms without denurting.froni its spirit or the scope of the appended claims.

Vhat I claim as newand desire to secure by Letters Patentjis:

1. In a blenkhez ting. furnace, everticzrlly elongated co nhustionf (illillfl l bfil li aying" provisiorint itslower endfor the discharge oftlie products of combustion therefrom), a, blnnl; guide extending to wzrrdlthe bottom thereof, a d aburner carried by the top of saidfurm ce and discharging downwsirtlly toward'the bottom of snid chaniber, thebl anks in Said guidejinoving in the direction of the burner discharge and directly in the path of the flame." Y I 2. In a bltmk heating furnace; a vertically elongated colnb'us'tion chamber haying pmvision atits lower, eud torthe discharge offtlie products of combustion therefrom, an ill-'- 'clined blank guide formed therein, a burner carried by the top of said furnace and dischar ing toward the bottom thereof, .the blan (S in said guide moving in the direction of the burner discharge and directly in the path of the flame, and means for discharging the blanks from the bottom of said chamber. 3. Ina blank heating furnace, a vertically elongated combustion chamber having means for graduating the heat toward a maximum at the lower end thereof and having provision at its lower endforthe discharge of the prod nets of combustion therefrom, a burner discharging towardsaid lower end, and means for guiding blanks longitudinally of said chamber directly in the path ofthe burner discharge to discharge said blanks adjacent said hottest end.

4. In a blankheating furnace, a vertically elongated combustion chamber having a relatively narrow portion tending to intensify the heat at the lower end thereof and having adjacent said lower end provision for the discharge ofthe products ofcombustion, and a burner carried by the top ofsaid furnacedi'scharging toward said end, andmeans for conducting blanks relative to said chamber to discharge adjacent said end.

5. In a blank heating furnace, a vertically elongated combustion chamber having proQ vision at its lower end for the discharge of the products of combustion ftherefroni and provided with a substantially vertical side wall and an inclined side wall to form a narrow portion at one end thereof for intensifying the heat at said end, and means for conveving a series of blanks along said inclined side wall to discharge said blanks adjacent the hottest point in said combustion chamber.

6. In a blank heating furnace. an elongated substantially vertical combustion chamber having provision at its lower end for the discharge of the products of combustion therefrom and having an inclined bottom and a burner discharging longitudinally therein, and means for conducting a series of blanks longitudinally along said chamber in the direction of the burner discharge.

7. In a blank heating furnace, a substantiallv vertical elongated combustion chamber having adjacent its lower end provision for the discharge of the products of combustion and provided with an inclined bottom and a substantially horizontal top. a burner car ried by said top, and means for conducting a series of blanks longitudinally of said chamber in the direction of the burner discharge.

8. In a blank heating furnace, a substantially vertical elongated combustion chamber provided with an inclined bottom and a substantially horizontal top, said combustion chamber having provision adjacent its lower end for the discharge of the combustion products, a burner carried by said top, means for conducting a series of blanks longitudinally of saidchamber in the directionof the burner discharge, and means to automatically discharge said blanks at the end of said chamber remote from said burner. I

9. In a blank heating furnace, a vertically elongated combustion chamberhaving means for graduating the heat towards a maximum at the lower end thereof, aburnerdischarging toward said end,'said chamber having provision for the discharge of the products of combustion adjacentits lowerend, and means for guiding the blanks through said chamber in the direction of the burner discharge to discharge adjacent said hottest end.

10. In a blank heating furnace, a combustion chamber. a blank guide formed therein. means to feed the blanks through the top of said chamber, means including a reciprocating plunger to eject the blanks from said chamber, and means for automatically'regulating the rate of movement of said ejecting means to vary the blank discharge in accordance with variations in combustion chamber temperature.

11. In a blank heating furnace, a vertically elongated combustion chamber, a burner discharging therein in a longitudinal direction thereof, said combustion chamber tapering in the direction of burner discharge and having a relatively restricted bottom for intensifying the heat, and adjacent said bottom provision for the discharge of the products of combustion. and means extending through said chamber for conducting a seriesof blanks towards the restricted end thereof to discharge.

12. In a blank heating furnace, a vertically elongated heating chamber having converging walls and at the smaller end thereof provisionfor the discharge of the products of combustion, a burner discharging longitudinally of said chamber generally in a direction of convergence of said walls, and

means for guiding a series of blanks long.i

tudinally of said chamber towards the smaller end thereof with only the portions to be worked extending into the path of said burner discharge.

13. In a blank heating furnace, a vertically elongated heating chamber having a relatively narrow lower end and having provision for the discharge of the products of combustion at said lower end, a burner discharging towardsaid narrow end, and means for guiding a series of blanks through said chamber to discharge adjacent said narrow end.

14. In a blank heating furnace, a vertically elongated tapered heating chamber having blank discharging means adjacent the relatively narrow bottom end thereof and having provision for the discharge of the products of combustion at said bottom end, a burner discharging toward the point of discharge of said blanks. and means to guide a series of blanks longitudinally of said chamber while subjecting; them, to conti meusg heat, and means to discharge theihlanksrothighesttem- PQEHUJFQ therefimm; adj acentpstiidfimu izqw end. 15. In a blankheatingfunnaee, a -vertically. elongated heating chamben li z y'ing i relativ ely restricted peption. at its, lcwen end he intensify the heat imdhm ing provision for the dischaege of the: roductsiefi combustion at said lower end n urneridischairging to; m ndv Silltlu 1'8Stlll0fi6(l.l)0ltl011g and meaneito guide :a, series of bltmk s throughfsaid chn mben and} towards saidrestricted: portion lwhile subjecting them; to continuous heat, and, meansto disehz rgetthe blanksicfthighest temperature fl'Oln-SZlldchamben adg'aeent said restricted, portiom 15.1w; blank,liez tingful'naee, e c0mbus-,

tion' chamber; means fer; supporting an stack 0f blanlzsin the furnace in vposition to .be

hezi tedfmechanism fondischarging th eblimke from snid furnace, aneleetr ic moton {Decontinuouely chiving said discharge. mechanism, and icontrqlnnez ns responsive tatemperatul'e in said cdmh'ustien chamber for cpntrolling;

, the ,eurrent flewtc said 1110150;

' 17; In ablankli eating furnace, cemliustiqn. chamber, a .ln ifner a 'ranged ,a t. one end thereof adhpted to generate different degrees of heat along, said. cpinhustion chamber, meiins fe supporting atseriescflhl inke at dif-* fer'ent ,pointsyelcng vsaid combustion chamber .in the path; ottliebu 'ner. discharge,. and means 01" autcmatically ejectingsaid blanks adj alrent the hottest pgint in the furnace, an 1 electric motor fcindi'ivingsz id ,e ecting niez ns,

continuously atdiffei'ent rates, and meens,re.

SDQnsiwe to temqperetune in said combusticn chamber ad acent the point of blank ,dischargefor controlling the current 511 i121 tn saidinotor to: centfol the rate 0 dizii re thereby. i A t 18. a ,blnnkheatingfurnace w combus tion chamhei', mea ne f olf admittingflblunks thereto, means for, maintaining the interior offseid chamber? at different substantially uniform l igh f temperatures, and. means controlled by the temperature withinsaid chain her for, entomatically successively discharging blanks therefrom while the tempe utmte,

therein i'e m z ins substantially constant- 19. In a blank heating frul'nace,,a combinat on chamber, means fm: admitting blanks thereto, ,means for discharging blanks T120111 sald chamber including a driv ng motor, and

meanslfor varying. the speed of saidmotcr while mnintaining ihe Same in motion mitemutically conti'elled by,the temperature w'iithw in said combustiemchzimber. i

20. In mblank; heating furnnce a tion chamhei', means fenbriiiging the in} terior ofsaidfchamber to a high temperzitm-c, means for admitting blanks [to the chamber in series, mezins for discharging them serially including a motor centim louslyl in motion during and in the intervalsrhetn'eem dis CHARLESROLSGOOD; 

